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vhost-user: wait until backend init is completed
The chardev waits for an initial connection before starting qemu, and
vhost-user should wait for the backend negotiation to be completed
before starting qemu too.
vhost-user is started in the net_vhost_user_event callback, which is
synchronously called after the socket is connected. Use a
VhostUserState.started flag to indicate vhost-user init completed
successfully and qemu can be started.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>